[#absl-once_flag-2constructor-07]
= xref:absl.adoc[absl]::xref:absl/once_flag.adoc[once_flag]::once_flag
:relfileprefix: ../../
:mrdocs:

Constructs a `once_flag` whose associated function has not yet run.

== Synopsis

Declared in `<absl/base/call_once.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
once_flag();
----


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